CN103726950A - Double-loop waste heat recovery system of two-stroke internal combustion engine - Google Patents
Double-loop waste heat recovery system of two-stroke internal combustion engine Download PDFInfo
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- CN103726950A CN103726950A CN201310755644.7A CN201310755644A CN103726950A CN 103726950 A CN103726950 A CN 103726950A CN 201310755644 A CN201310755644 A CN 201310755644A CN 103726950 A CN103726950 A CN 103726950A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses a double-loop waste heat recovery system of a two-stroke internal combustion engine. According to the technical scheme, working medium sides of a high-temperature heat exchanger, a first expansion machine, a radiator and a water pump and the water jacket side of the engine are sequentially connected to form a first loop Rankine cycle system. Working medium sides of a low-temperature pre-heater, a low-temperature heat exchanger, a second expansion machine and the radiator and a working medium pump are sequentially connected to form a second loop Rankine cycle system. A first cycle loop is connected with a second cycle loop through the radiator. Air enters an engine air cylinder through a turbocharger and the lower-temperature pre-heater, and high-temperature exhaust air of the air cylinder is exhausted through the turbocharger, the high-temperature heat exchanger and the low-temperature heat exchanger. The limits, on exhaust air waste heat recovery of the engine, of the ORC technology are broken through, through reasonable layout assembly, the assembly space of the whole engine is sufficiently utilized, and the recovery efficiency of waste heat is improved substantially.
Description
Technical field
The invention belongs to afterheat of IC engine and utilize technology, be specifically related to a kind of two stroke IC engine Double-loop energy-saving and reduce discharging residual neat recovering system.
Background technique
Outstanding along with energy shortage and environmental pollution problem, the technical measures that combustion engine energy-saving reduces discharging are day by day subject to common people and pay close attention to.Organic Rankine circulation (ORC), with its thermal efficiency and the higher feature of Security, has become afterheat of IC engine at present and has reclaimed the focus of research.But the decomposition temperature of ORC working medium used is generally lower than 350 ℃, and engine exhaust temperature is generally up to 500～600 ℃.Higher temperature likely can cause organic working medium to decompose, and this is one of the key point that restriction ORC recycles at high-temperature residual heat.On the other hand, ORC is for the circulation means of other heat recovery, though structure is relatively simple, but larger as its system bulk of recovery device for waste, be installed on the restriction that motor will be subject to final assembly space, this is also the main cause that restriction ORC reclaims for afterheat of IC engine.
The technology of Rankine cycle recovery waste heat concentrates in four stroke engine mostly at present.In two stroke IC engine cylinder block, have three holes, i.e. inlet hole, exhaust port and air-vent completes once circulation in two strokes, and power per liter is large, simple in structure, light.But two stroke IC engine scavenging wasted work is large, and fuel consumption rate is high, and emission performance is poor, if its exhaust heat is reclaimed, its economy and environment benefit is larger.In addition, the contrary cyclic process of two stroke IC engine can be made inflation process.Its way is that air-vent is become to exhaust port, and outlet valve is used for controlling air inlet and flows, and like this, two stroke IC engine just can be used as decompressor, thereby saves the decompressor in ORC system, reduces system scale and cost.
Therefore, if can propose a kind of high-temperature residual heat of engine exhaust fully can recovery, do not need again to change the assembling layout of system on a large scale, be promote combustion engine energy-saving emission-reduction technology required simultaneously.
Summary of the invention
For above-mentioned technological deficiency, the object of the invention is to propose a kind of two stroke IC engine double loop residual neat recovering system.
Below in conjunction with accompanying drawing, principle of the present invention and system composition are described.Two stroke IC engine double loop residual neat recovering system comprises: high-temperature heat-exchanging, cryogenic heat exchanger, the one the second decompressors, radiator, water pump, working medium pump, intercooler, motor and turbosupercharger etc.Its system design scheme is: by high-temperature heat-exchanging, the first decompressor, radiator, the working medium side of 4 parts of the first working medium pump and the water jacket side of motor, connected successively composition the first loop Rankine cycle system.Working medium side and the second working medium pump by intercooler, cryogenic heat exchanger, the second decompressor, 4 parts of radiator connect successively, composition second servo loop Rankine cycle system.The first circulation loop is connected with the second circulation loop by radiator, and air enters cylinder through turbosupercharger, intercooler, and the high-temperature exhaust air of cylinder is discharged after turbosupercharger, high-temperature heat-exchanging and cryogenic heat exchanger heat exchange.Motor is 6 Cylinder engines, and the first decompressor is the first cylinder of motor; The second decompressor is the 6th cylinder of motor.
On cylinder, have inlet and outlet and scavenge port, when the piston in cylinder moves reciprocatingly, volume of cylinder just changes periodically, and it matches with the keying of intakeport, relief opening, realizes the work cycle of expansion exhaust and pressure of inspiration(Pi) compression process.The inverse process of two stroke engine work and the working procedure of reciprocating expansion engine are similar, and the working medium that is only working in these two cylinders is not fuel mixture, but cycle fluid.Therefore, two cylinders in motor of the present invention, are used as reciprocating expansion engine by the replacing of inlet and outlet procedural order, thereby save the decompressor in ORC system, reduce system scale and cost.
System principle is: the first loop Rankine cycle is steam Rankine cycle, and the working medium that adopts is engine cooling water.The thermal source of the first loop Rankine cycle is the high-temperature residual heat of engine exhaust, utilizes steam circulation to drive engine power generation.Cooling water can make cooling system all the time in best working state on the one hand, guarantees the normal working temperature of internal-combustion engine, on the other hand, as the working medium of Rankine cycle, in whole system, plays a dual role again, and simplification system reduces system operation cost.The thermal source of second servo loop Rankine cycle is mainly the engine exhaust after (with high-temperature heat-exchanging) heat exchange, high-temp waste gas through with high-temperature heat-exchanging heat exchange after, its temperature has been down to below 350 ℃, so can adopt the organic Rankine circulation that is suitable for middle high temperature heat source, realize thus making full use of of two stroke IC engine exhaust heat, reach energy-conservation and object system high efficiency thermodynamic cycle.
Feature of the present invention and beneficial effect are, can break through the restriction of (lower organic working medium decomposition temperature) ORC technology on exhaust heat of internal combustion engine reclaims, realize the safe and efficient recovery of waste gas residual heat, do not need the total arrangement of system to do too much adjustment simultaneously, take excessive space, reach the object of energy-saving and emission-reduction.
Accompanying drawing explanation
Shown in accompanying drawing be system unit linkage structure schematic diagram of the present invention.Black solid line in figure represents intake and exhaust path, and short dash line represents the first loop Rankine cycle, and long dotted line represents second servo loop Rankine cycle.
Embodiment
Below in conjunction with accompanying drawing and by embodiment, principle of the present invention and the plan of establishment are described further.It should be noted that the present embodiment is narrative, but not be determinate, with this, do not limit protection scope of the present invention.
Two stroke IC engine double loop residual neat recovering system, its system consists of: by the working medium side of 4 parts described in high-temperature heat-exchanging 1, the first decompressor 2, radiator 4, the first working medium pump 3 and the water jacket side of motor 9, connected successively composition the first loop Rankine cycle system (scheming short-and-medium broken line frame).Working medium side and the second working medium pump 8 by 4 parts described in intercooler 5, cryogenic heat exchanger 6, the second decompressor 7, radiator connect successively, composition second servo loop Rankine cycle system (long broken line frame in figure), the first circulation loop is connected with the second circulation loop by radiator.Air enters cylinder through turbosupercharger 10, intercooler, and the high-temperature exhaust air of cylinder is discharged after turbosupercharger, high-temperature heat-exchanging and cryogenic heat exchanger heat exchange.Motor is 6 Cylinder engines, and the first decompressor is the first cylinder of motor; The second decompressor is the 6th cylinder of motor.Working medium in the first loop Rankine cycle is water.In second servo loop circulation, working medium used is R245fa(CF
3cH
2cHF
2).Turbosupercharger comprises two-part, i.e. turbo machine and gas compressor, is connected and formed turbosupercharger by axle.
Working procedure of the present invention is: fresh air enters cylinder through turbosupercharger (gas compressor compression), intercooler (preheating) and participates in burning after mixing with fuel oil.High-temperature exhaust air is discharged through (turbo machine) turbosupercharger, high-temperature heat-exchanging, cryogenic heat exchanger from outlet pipe.Working medium (water) is sent into motor by the first working medium pump, as cooling water, cylinder is carried out coolingly, and now cooling water is heated, is heated into saturated vapour afterwards through high-temperature heat-exchanging, sends into the first decompressor acting.Exhaust steam after acting is cooling through radiator is liquid, again sends back to pump place.Organic working medium enters cryogenic heat exchanger after sending into intercooler preheating by the second working medium pump, and the high temperature and high pressure gas that heat exchange is evaporated to saturated (or overheated) is sent into the second decompressor acting, cooling through radiator afterwards, sends the second working medium pump back to, continues to participate in circulation.
Native system assembles by rational layout, is fully used in motor final assembly space, on the basis that makes engine high-temperature exhaust air waste heat obtain utilizing, all the other heat recovery efficiencies is largely increased.
Claims (4)
1. two stroke IC engine double loop residual neat recovering system, comprise high-temperature heat-exchanging, cryogenic heat exchanger, decompressor, radiator, working medium pump, intercooler, turbosupercharger and motor etc., it is characterized in that: by high-temperature heat-exchanging (1), the first decompressor (2), radiator (4), the working medium side of described 4 parts of the first working medium pump (3) and the water jacket side of motor (9), connected successively composition the first loop Rankine cycle system; Working medium side and the second working medium pump (8) by 4 parts described in intercooler (5), cryogenic heat exchanger (6), the second decompressor (7), radiator connect successively, composition second servo loop Rankine cycle system, the first circulation loop is connected with the second circulation loop by radiator, air enters cylinder through turbosupercharger (10), intercooler, and the high-temperature exhaust air of cylinder is discharged after turbosupercharger, high-temperature heat-exchanging and cryogenic heat exchanger heat exchange.
2. two stroke IC engine according to claim 1 double loop residual neat recovering system, is characterized in that described motor (9) is 6 Cylinder engines, and described the first decompressor is the first cylinder of motor; Described the second decompressor is the 6th cylinder of motor.
3. two stroke IC engine according to claim 1 double loop residual neat recovering system, is characterized in that the working medium in described the first loop Rankine cycle is water.
4. two stroke IC engine according to claim 1 double loop residual neat recovering system, is characterized in that the working medium in described second servo loop circulation is R245fa.
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| CN201310755644.7A CN103726950B (en) | 2013-12-27 | 2013-12-27 | Double-loop waste heat recovery system of two-stroke internal combustion engine |
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| CN201310755644.7A CN103726950B (en) | 2013-12-27 | 2013-12-27 | Double-loop waste heat recovery system of two-stroke internal combustion engine |
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| CN103726950B CN103726950B (en) | 2016-01-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632357B (en) * | 2014-12-30 | 2017-01-11 | 清华大学 | Two-stage supercharging system of internal combustion engine |
| CN106523237A (en) * | 2015-09-09 | 2017-03-22 | 现代自动车株式会社 | Engine preheating apparatus and preheating method of the engine |
| CN106812575A (en) * | 2016-12-26 | 2017-06-09 | 潍柴动力股份有限公司 | A kind of application blast pipe carries out the device and its control method of waste heat recovery |
| CN114000926A (en) * | 2021-11-01 | 2022-02-01 | 哈尔滨工程大学 | Exhaust and shunt two-stage waste heat utilization system of low-speed diesel engine |
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| JP2010188949A (en) * | 2009-02-20 | 2010-09-02 | Nissan Motor Co Ltd | Vehicle having waste heat recovery system mounted thereon |
| JP2011140879A (en) * | 2010-01-05 | 2011-07-21 | Yanmar Co Ltd | Waste heat recovery system of supercharged engine |
| CN102834591A (en) * | 2010-04-26 | 2012-12-19 | 三菱重工业株式会社 | Exhaust heat recovery power generation device and vessel provided therewith |
| CN202851187U (en) * | 2012-04-12 | 2013-04-03 | 北京工业大学 | Power generation system using exhausting and cooling waste heat in internal combustion engine at the same time |
| CN103352772A (en) * | 2013-06-25 | 2013-10-16 | 天津大学 | Combined cycle thermoelectric conversion system utilizing multi-grade waste heat of internal combustion engine |
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2013
- 2013-12-27 CN CN201310755644.7A patent/CN103726950B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010188949A (en) * | 2009-02-20 | 2010-09-02 | Nissan Motor Co Ltd | Vehicle having waste heat recovery system mounted thereon |
| JP2011140879A (en) * | 2010-01-05 | 2011-07-21 | Yanmar Co Ltd | Waste heat recovery system of supercharged engine |
| CN102834591A (en) * | 2010-04-26 | 2012-12-19 | 三菱重工业株式会社 | Exhaust heat recovery power generation device and vessel provided therewith |
| CN202851187U (en) * | 2012-04-12 | 2013-04-03 | 北京工业大学 | Power generation system using exhausting and cooling waste heat in internal combustion engine at the same time |
| CN103352772A (en) * | 2013-06-25 | 2013-10-16 | 天津大学 | Combined cycle thermoelectric conversion system utilizing multi-grade waste heat of internal combustion engine |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632357B (en) * | 2014-12-30 | 2017-01-11 | 清华大学 | Two-stage supercharging system of internal combustion engine |
| CN106523237A (en) * | 2015-09-09 | 2017-03-22 | 现代自动车株式会社 | Engine preheating apparatus and preheating method of the engine |
| CN106523237B (en) * | 2015-09-09 | 2020-01-07 | 现代自动车株式会社 | Engine preheating device and engine preheating method |
| CN106812575A (en) * | 2016-12-26 | 2017-06-09 | 潍柴动力股份有限公司 | A kind of application blast pipe carries out the device and its control method of waste heat recovery |
| CN114000926A (en) * | 2021-11-01 | 2022-02-01 | 哈尔滨工程大学 | Exhaust and shunt two-stage waste heat utilization system of low-speed diesel engine |
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| CN103726950B (en) | 2016-01-20 |
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